Kolsewadi police said that Nandkishore Waghmare, 36, was arrested on the basis of a complaint filed by the parents of the teenaged girl.
The incident happened in the Vijaynagar locality of Kalyan (east).
Sub-Inspector PV Pansare of the Kolsewadi police sdaid that Waghmare was also the functionary of a political party.
The complaint stated that the girl,15, was bathing at around 9:30am yesterday when she noticed some movement behind the window of the bathroom.
The complaint further stated that the parents of the girl, on being alerted by her, found the accused walking around suspiciously near the window.
The police have booked the accused under sections 354(C) and 506 of the IPC and also section 12 of the POCSO Act, police said.
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